Wilheim,
I see what you mean about the those flipping (no vulgarity intended)
flat spots, depending on the direction of the scan, left to right, or
right to left.
I have no way to account for this. I suspect the flip flop must occur
when setting the alphaData, but that is a wild guess.
I wrote a CARD script which seems to confirm that the TOP and LEFT of
a rectangle are within (in the Run Rev within() fuction sense) while
the right and bottom are not.
If you create a square graphic, 100 units on a side and make it
opaque, you will find if you click into the square and run the mouse
over the square, that the two within functions (user defined and Run
Rev defined) do agree on the RIGHT and BOTTOM but they do not agree
on the TOP and LEFT. Of course they agree everywhere within the
boundary.
So the mystery goes on.
local myname, X0, Y0
on mouseDown
put the name of the target into myName
put myName
put the topleft of myName into tXY
put item 1 of tXY into X0
put item 2 of tXY into Y0
end mouseDOwn
on mouseUP
put "" into myName
end mouseUP
on mouseMove u,v
if myName is "" then exit mouseMove
put u,v into tPt
--Get displacement from upper left corner
put u - x0 into dx
put v - y0 into dy
--User defined "within" function
if dx > 0 and dx < 100 and dy > 0 and dy < 100 then
put true into myWithin
else
put false into myWithin
end if
--Built-in within() function
if within(myName, tPt) then
put true into runRevWithin
else
put false into runRevWithin
end if
put myWithin & cr & runRevWIthin into msg box
end mouseMove
Jim Hurley
Message: 10
Date: Thu, 23 Oct 2008 23:15:05 +0200
From: Wilhelm Sanke <[EMAIL PROTECTED]>
Subject: [ANN] and Re: Problem with mask
To: use-revolution@lists.runrev.com
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have uploaded a sample stack containing 8 different scripts for
creating masks and generating oval images.
<http://www.sanke.org/Software/ThreeMasks.zip>.
Stack "Three Masks" demonstrates and lets you compare the
approaches of
Jim Hurley, Scott Rossi, and my own.
All examples use the same basic selelection procedure with a
draggable,
resizable, and reshapable and already grouped selection graphic
(applying the same routines I use for my selection graphic of stack
"Seamless Tiles 2"), which makes it easy to compare the effects of a
specific identical size and shape of the selection graphic across
the 8
examples.
There are three examples based on Jim's script:
- The first uses his almost unchanged script, which produced the "mask
problem" with flattened edges on the right and at the bottom.
- In the second exampled I have reversed the direction of Jim's
"within"-scan, with the result that now the edges appear on the
left and
on top
Because of the different edge effects I am not sure if the "mask
problem" is caused by a bug in the within-function or could rather be
remedied by more precise (?) scan routines. I have tried to change
this
part of the script in various ways, but without success. Maybe Bernd
Niggemann' approach, which I could not yet include here, will show
other
possibilities.
- The workaround-solution of the "mask problem" in the third example
based on Jim's script combines the two examples above. I use a scan in
two directions producing two masks with edges at different places. I
then combine the two masks, which then results in a perfectly rounded
mask without any flattened edges.
All oval images produced by the above examples display a slight
"roughness".
Scott Ross's approach, taking a snapshot from the rect of the
selection
graphic, produces oval images with a very smooth fringe.
As my selection tool is already a grouped one, in my minor necessary
adaptation of Scott's script the grouping and later ungrouping of the
oval graphic was no longer needed, as was also the resetting the
templategroup.
I am wondering if we could avoid or suppress the flickering that
appears
when taking the snapshot?
In my own 4 examples no masks are created by script. I use
prefabricated
masks in the form of imported invisible images that are then
adapted to
the size and shape of the oval selection graphic. Hence, basically
only
4 script lines are needed to crop the image and apply the mask.
The masks selected as examples are named "plain oval", "small fringe",
"wide fringe", and "transition".
Best regards,
Wilhelm Sanke
<http://www.sanke.org/MetaMedia>
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